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Signore MA, Rescio G, Francioso L, Casino F, Leone A. Aluminum Nitride Thin Film Piezoelectric Pressure Sensor for Respiratory Rate Detection. SENSORS (BASEL, SWITZERLAND) 2024; 24:2071. [PMID: 38610281 PMCID: PMC11014281 DOI: 10.3390/s24072071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 03/15/2024] [Accepted: 03/22/2024] [Indexed: 04/14/2024]
Abstract
In this study, we propose a low-cost piezoelectric flexible pressure sensor fabricated on Kapton® (Kapton™ Dupont) substrate by using aluminum nitride (AlN) thin film, designed for the monitoring of the respiration rate for a fast detection of respiratory anomalies. The device was characterized in the range of 15-30 breaths per minute (bpm), to simulate moderate difficult breathing, borderline normal breathing, and normal spontaneous breathing. These three breathing typologies were artificially reproduced by setting the expiratory to inspiratory ratios (E:I) at 1:1, 2:1, 3:1. The prototype was able to accurately recognize the breath states with a low response time (~35 ms), excellent linearity (R2 = 0.997) and low hysteresis. The piezoelectric device was also characterized by placing it in an activated carbon filter mask to evaluate the pressure generated by exhaled air through breathing acts. The results indicate suitability also for the monitoring of very weak breath, exhibiting good linearity, accuracy, and reproducibility, in very low breath pressures, ranging from 0.09 to 0.16 kPa. These preliminary results are very promising for the future development of smart wearable devices able to monitor different patients breathing patterns, also related to breathing diseases, providing a suitable real-time diagnosis in a non-invasive and fast way.
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Affiliation(s)
| | - Gabriele Rescio
- The National Research Council, Institute for Microelectronics and Microsystems (CNR IMM), Via Monteroni, 73100 Lecce, Italy; (M.A.S.); (L.F.); (F.C.); (A.L.)
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Tan YJ, Crowley RJ, Ioannidis JPA. An empirical assessment of research practices across 163 clinical trials of tumor-bearing companion dogs. Sci Rep 2019; 9:11877. [PMID: 31417164 PMCID: PMC6695388 DOI: 10.1038/s41598-019-48425-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 07/26/2019] [Indexed: 11/23/2022] Open
Abstract
Comparative clinical trials of domestic dogs with spontaneously-occurring cancers are increasingly common. Canine cancers are likely more representative of human cancers than induced murine tumors. These trials could bridge murine models and human trials and better prioritize drug candidates. Such investigations also benefit veterinary patients. We aimed to evaluate the design and reporting practices of clinical trials containing ≥2 arms and involving tumor-bearing dogs. 163 trials containing 8552 animals were systematically retrieved from PubMed (searched 1/18/18). Data extracted included sample sizes, response criteria, study design, and outcome reporting. Low sample sizes were prevalent (median n = 33). The median detectable hazard ratio was 0.3 for overall survival and 0.06 for disease progression. Progressive disease thresholds for studies that did not adopt VCOG-RECIST guidelines varied in stringency. Additionally, there was significant underreporting across all Cochrane risk of bias categories. The proportion of studies with unclear reporting ranged from 44% (randomization) to 94% (selective reporting). 72% of studies also failed to define a primary outcome. The present study confirms previous findings that clinical trials in dogs need to be improved, particularly regarding low statistical power and underreporting of design and outcomes.
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Affiliation(s)
- Yuan Jin Tan
- Department of Health Research and Policy, Division of Epidemiology, Stanford School of Medicine, Stanford, CA, USA.,Meta-Research Innovation Center at Stanford (METRICS), Stanford University, Stanford, CA, USA
| | - Ryan J Crowley
- Department of Statistics, Stanford University School of Humanities and Sciences, Stanford, CA, USA.,Meta-Research Innovation Center at Stanford (METRICS), Stanford University, Stanford, CA, USA
| | - John P A Ioannidis
- Department of Health Research and Policy, Division of Epidemiology, Stanford School of Medicine, Stanford, CA, USA. .,Department of Statistics, Stanford University School of Humanities and Sciences, Stanford, CA, USA. .,Stanford Prevention Research Center, Department of Medicine, and Department of Biomedical Data Science, Stanford University School of Medicine, Stanford, CA, USA. .,Meta-Research Innovation Center at Stanford (METRICS), Stanford University, Stanford, CA, USA.
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Ciria HMC, González MM, Zamora LO, Cabrales LEB, Sierra González GV, de Oliveira LO, Zanella R, Buzaid AC, Parise O, Brito LM, Teixeira CAA, Gomes MDN, Moreno G, Feo da Veiga V, Telló M, Holandino C. Antitumor effects of electrochemical treatment. Chin J Cancer Res 2013; 25:223-34. [PMID: 23592904 PMCID: PMC3626978 DOI: 10.3978/j.issn.1000-9604.2013.03.03] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2013] [Accepted: 03/27/2013] [Indexed: 11/14/2022] Open
Abstract
Electrochemical treatment is an alternative modality for tumor treatment based on the application of a low intensity direct electric current to the tumor tissue through two or more platinum electrodes placed within the tumor zone or in the surrounding areas. This treatment is noted for its great effectiveness, minimal invasiveness and local effect. Several studies have been conducted worldwide to evaluate the antitumoral effect of this therapy. In all these studies a variety of biochemical and physiological responses of tumors to the applied treatment have been obtained. By this reason, researchers have suggested various mechanisms to explain how direct electric current destroys tumor cells. Although, it is generally accepted this treatment induces electrolysis, electroosmosis and electroporation in tumoral tissues. However, action mechanism of this alternative modality on the tumor tissue is not well understood. Although the principle of Electrochemical treatment is simple, a standardized method is not yet available. The mechanism by which Electrochemical treatment affects tumor growth and survival may represent more complex process. The present work analyzes the latest and most important research done on the electrochemical treatment of tumors. We conclude with our point of view about the destruction mechanism features of this alternative therapy. Also, we suggest some mechanisms and strategies from the thermodynamic point of view for this therapy. In the area of Electrochemical treatment of cancer this tool has been exploited very little and much work remains to be done. Electrochemical treatment constitutes a good therapeutic option for patients that have failed the conventional oncology methods.
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Affiliation(s)
- Héctor Manuel Camué Ciria
- Research Department, National Centre of Applied Electromagnetism, Oriente University, GP 4078, Santiago de Cuba, Cuba
| | | | | | - Luis Enrique Bergues Cabrales
- Research Department, National Centre of Applied Electromagnetism, Oriente University, GP 4078, Santiago de Cuba, Cuba
| | | | | | - Rodrigo Zanella
- Veterinary Teaching Hospital, Federal University of Rio Grande do Sul. Porto Alegre, RS, Brazil
| | | | | | - Luciana Macedo Brito
- Faculty of Pharmacy, Medicine Department, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Marina das Neves Gomes
- Faculty of Pharmacy, Medicine Department, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gleyce Moreno
- Faculty of Pharmacy, Medicine Department, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Venicio Feo da Veiga
- Faculty of Pharmacy, Medicine Department, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- Professor Paulo de Góes Institute of Microbiology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marcos Telló
- Pontifical Catholic University of Rio Grande do Sul. Porto Alegre, RS, Brazil
| | - Carla Holandino
- Faculty of Pharmacy, Medicine Department, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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